Coil switch



April 1934- B. E. SHERRILL 1,956,207

COIL SWITCH Filed May 19, 1933 2 Sheets-Sheet 1 ummnmm Inventor q By flllomey April 24, 1934- a. E. SHERRILL COIL SWITCH Filed May 19, 1933 2i Sheets-Sheet 2 Inventor "5 Far? 5 SZe/W'IY/ Patented Apr. 24, 1934 UNITED STATES PATENT OFFICE 2 Claims.

This invention appertains to new and useful improvements in radiant energy, and more particularly to mounts for coils, such as are used in high frequency receivers, for changing the frequency bands.

An important object of the present invention is to provide a coil mount of the character stated which can be operated by a single manual control.

Another important object of the invention is to provide a coil switch of the character stated which will eliminate all plug-in coils, but which will retain their efiiciency because of the fact that every contact in the circuit is broken and any coil not in use is completely eliminated from the circuit, thus avoiding all dead end losses, such as common in coils and switch device where only one contact is broken, leaving the other present in the circuit.

Other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:

Figure 1 represents a side elevational view of the switching device.

Figure 2 represents a vertical sectional view through the device.

Figure 3 represents a rear elevational view of the structure.

Figure 4 represents a vertical sectional view taken substantially on line 44 of Figure 1.

Figure 5 represents a perspective view of the contact mount.

Referring to the drawings, wherein like numerals designate like parts, it can be seen in Figure 1, that numeral 5 represents the U- shaped support which has openings in the leg portions thereof to receive the bearings 6 through which the control shaft 7 is journaled.

Numeral 8 represents a circular panel which is provided centrally with an opening through which the threaded extension 9 of the collar 10 is disposed, this extension being provided with a nut 11 for securing the panel 8 to the said collar 10.

Secured to one side of the panel 8 by screws 12 are the tubes 13 on which the windings 14 are placed.

As each of these frequency coils consists of two windings, there are four prongs 15 projecting for each tube 13 beyond the opposite side of the panel 8 and in the path of the spring contact fingers 16 on the di-electric plate 17. There are two di-electric plates, namely, plate 17 and plate 18, the spring contact fingers 16 having their inner ends bent laterally between the plates 17 and 18, as at 19. Suitable connections can be taken off of these contact fingers 16.

As is clearly shown in Figure 4, each contact finger consists of a head portion having substantially right angularly disposed extensions 20 which serve to guide the corresponding prong 15 into the recess 21 which is located between these end portions 20, as in the manner substantially shown in Figure 4. Furthermore, these fingers 18 are offset, as shown in Figure 4, so as to each be situated on a different imaginary annulus concentric with the shaft 7 so as to each catch an individual prong 15 of the desired coil.

The plates 17-18 are secured to the forward leg of the U-shaped support 5, and obviously, a suitable control knob or handle can be placed on one end of the shaft '7 to permit operation thereof.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the claimed as new is:

1. A coil switch of the character described comprising a rotatable panel, a plurality of coils on said panel, each coil being provided with a plurality of laterally extending contact prongs, a stationary group of contacts, said stationary contacts being located in the path of the laterally extending prongs, and each comprising a resilient piece of material, having a recess therein for receiving the corresponding coil prongs, and laterally extending arms for guiding the prongs in the recess, each of said prongs being located on a different imaginary annulus concentric with the axis of the rotatable panel.

2. A coil switch of the character described comprising a stationary group of contacts, a rotatable panel, a plurality of coils on the panel, each coil being provided with a plurality of contactor prongs, the said stationary contacts being located in the path of the said prongs, each of the said prongs being located on a different imaginary annulus concentric with the axis of the rotatable panel and being of spring material and each having a recess therein for receiving the corresponding coil prong.

invention, what is BURL E. SHERRILL. 

